|km|Municipality|Location|Interescting highway|Notes|
|---|---|---|---|---|
|0|Canada-United States border|Canada-United States border|ND 18 – Cavalier, Larimore|PTH 30 begins|
|3|R.M. of Rhineland|Gretna|PR 243 east – Emerson|begin PR 243 west concurrence|
|5|R.M. of Rhineland||PR 243 west – Blumenfeld|end PR 243 west concurrence|
|10|R.M. of Rhineland||PR 421 east – Sommerfeld||
|14|R.M. of Rhineland|Altona|PR 201 west – Brown, Windygates, Snowflake|begin PR 201 east concurrence|
|18|R.M. of Rhineland||PR 201 east – Letellier, Dominion City, Stuartburn|end PR 201 east concurrence|
|25|R.M. of Rhineland|Rosenfeld|PTH 14 – Morden, Winkler, Plum Coulee, Morris  PR 332 north – Lowe Farm, Brunkild, Starbuck|PTH 30 ends highway continues as PR 332|

Question: how many cities are represented in the intersecting highway category?
Answer: 18